author | igerasim |
Tue, 02 Oct 2018 10:19:07 -0700 | |
changeset 51986 | c1db377f6300 |
parent 47413 | 17b77ca4d419 |
child 52856 | 5f3b9b633731 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.security.x509; |
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import java.io.IOException; |
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import java.util.Locale; |
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import sun.security.util.*; |
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/** |
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* This class implements the DNSName as required by the GeneralNames |
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* ASN.1 object. |
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* <p> |
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* [RFC2459] When the subjectAltName extension contains a domain name service |
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* label, the domain name MUST be stored in the dNSName (an IA5String). |
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* The name MUST be in the "preferred name syntax," as specified by RFC |
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* 1034 [RFC 1034]. Note that while upper and lower case letters are |
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* allowed in domain names, no signifigance is attached to the case. In |
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* addition, while the string " " is a legal domain name, subjectAltName |
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* extensions with a dNSName " " are not permitted. Finally, the use of |
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* the DNS representation for Internet mail addresses (wpolk.nist.gov |
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* instead of wpolk@nist.gov) is not permitted; such identities are to |
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* be encoded as rfc822Name. |
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* |
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* @author Amit Kapoor |
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* @author Hemma Prafullchandra |
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*/ |
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public class DNSName implements GeneralNameInterface { |
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private String name; |
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private static final String alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; |
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private static final String digitsAndHyphen = "0123456789-"; |
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private static final String alphaDigitsAndHyphen = alpha + digitsAndHyphen; |
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/** |
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* Create the DNSName object from the passed encoded Der value. |
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* |
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* @param derValue the encoded DER DNSName. |
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* @exception IOException on error. |
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*/ |
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public DNSName(DerValue derValue) throws IOException { |
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name = derValue.getIA5String(); |
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} |
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/** |
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* Create the DNSName object with the specified name. |
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* |
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* @param name the DNSName. |
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* @throws IOException if the name is not a valid DNSName subjectAltName |
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*/ |
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public DNSName(String name) throws IOException { |
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if (name == null || name.length() == 0) |
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throw new IOException("DNS name must not be null"); |
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if (name.indexOf(' ') != -1) |
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throw new IOException("DNS names or NameConstraints with blank components are not permitted"); |
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if (name.charAt(0) == '.' || name.charAt(name.length() -1) == '.') |
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throw new IOException("DNS names or NameConstraints may not begin or end with a ."); |
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//Name will consist of label components separated by "." |
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//startIndex is the index of the first character of a component |
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//endIndex is the index of the last character of a component plus 1 |
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for (int endIndex,startIndex=0; startIndex < name.length(); startIndex = endIndex+1) { |
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endIndex = name.indexOf('.', startIndex); |
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if (endIndex < 0) { |
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endIndex = name.length(); |
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} |
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if ((endIndex-startIndex) < 1) |
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throw new IOException("DNSName SubjectAltNames with empty components are not permitted"); |
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//DNSName components must begin with a letter A-Z or a-z |
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if (alpha.indexOf(name.charAt(startIndex)) < 0) |
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throw new IOException("DNSName components must begin with a letter"); |
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//nonStartIndex: index for characters in the component beyond the first one |
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for (int nonStartIndex=startIndex+1; nonStartIndex < endIndex; nonStartIndex++) { |
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char x = name.charAt(nonStartIndex); |
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if ((alphaDigitsAndHyphen).indexOf(x) < 0) |
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throw new IOException("DNSName components must consist of letters, digits, and hyphens"); |
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} |
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} |
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this.name = name; |
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} |
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/** |
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* Return the type of the GeneralName. |
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*/ |
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public int getType() { |
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return (GeneralNameInterface.NAME_DNS); |
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} |
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/** |
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* Return the actual name value of the GeneralName. |
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*/ |
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public String getName() { |
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return name; |
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} |
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/** |
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* Encode the DNS name into the DerOutputStream. |
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* |
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* @param out the DER stream to encode the DNSName to. |
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* @exception IOException on encoding errors. |
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*/ |
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public void encode(DerOutputStream out) throws IOException { |
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out.putIA5String(name); |
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} |
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/** |
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* Convert the name into user readable string. |
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*/ |
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public String toString() { |
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return ("DNSName: " + name); |
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} |
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/** |
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* Compares this name with another, for equality. |
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* |
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* @return true iff the names are equivalent |
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* according to RFC2459. |
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*/ |
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public boolean equals(Object obj) { |
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if (this == obj) |
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return true; |
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if (!(obj instanceof DNSName)) |
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return false; |
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DNSName other = (DNSName)obj; |
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// RFC2459 mandates that these names are |
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// not case-sensitive |
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return name.equalsIgnoreCase(other.name); |
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} |
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/** |
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* Returns the hash code value for this object. |
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* |
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* @return a hash code value for this object. |
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*/ |
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public int hashCode() { |
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return name.toUpperCase(Locale.ENGLISH).hashCode(); |
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} |
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/** |
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* Return type of constraint inputName places on this name:<ul> |
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* <li>NAME_DIFF_TYPE = -1: input name is different type from name (i.e. does not constrain). |
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* <li>NAME_MATCH = 0: input name matches name. |
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* <li>NAME_NARROWS = 1: input name narrows name (is lower in the naming subtree) |
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* <li>NAME_WIDENS = 2: input name widens name (is higher in the naming subtree) |
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* <li>NAME_SAME_TYPE = 3: input name does not match or narrow name, but is same type. |
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* </ul>. These results are used in checking NameConstraints during |
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* certification path verification. |
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* <p> |
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* RFC2459: DNS name restrictions are expressed as foo.bar.com. Any subdomain |
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* satisfies the name constraint. For example, www.foo.bar.com would |
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* satisfy the constraint but bigfoo.bar.com would not. |
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* <p> |
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* draft-ietf-pkix-new-part1-00.txt: DNS name restrictions are expressed as foo.bar.com. |
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* Any DNS name that |
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* can be constructed by simply adding to the left hand side of the name |
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* satisfies the name constraint. For example, www.foo.bar.com would |
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* satisfy the constraint but foo1.bar.com would not. |
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* <p> |
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* RFC1034: By convention, domain names can be stored with arbitrary case, but |
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* domain name comparisons for all present domain functions are done in a |
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* case-insensitive manner, assuming an ASCII character set, and a high |
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* order zero bit. |
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* |
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* @param inputName to be checked for being constrained |
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* @return constraint type above |
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* @throws UnsupportedOperationException if name is not exact match, but narrowing and widening are |
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* not supported for this name type. |
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*/ |
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public int constrains(GeneralNameInterface inputName) throws UnsupportedOperationException { |
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int constraintType; |
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if (inputName == null) |
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constraintType = NAME_DIFF_TYPE; |
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else if (inputName.getType() != NAME_DNS) |
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constraintType = NAME_DIFF_TYPE; |
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else { |
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String inName = |
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(((DNSName)inputName).getName()).toLowerCase(Locale.ENGLISH); |
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String thisName = name.toLowerCase(Locale.ENGLISH); |
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if (inName.equals(thisName)) |
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constraintType = NAME_MATCH; |
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else if (thisName.endsWith(inName)) { |
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int inNdx = thisName.lastIndexOf(inName); |
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if (thisName.charAt(inNdx-1) == '.' ) |
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constraintType = NAME_WIDENS; |
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else |
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constraintType = NAME_SAME_TYPE; |
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} else if (inName.endsWith(thisName)) { |
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int ndx = inName.lastIndexOf(thisName); |
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if (inName.charAt(ndx-1) == '.' ) |
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constraintType = NAME_NARROWS; |
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else |
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constraintType = NAME_SAME_TYPE; |
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} else { |
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constraintType = NAME_SAME_TYPE; |
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} |
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} |
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return constraintType; |
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} |
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/** |
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* Return subtree depth of this name for purposes of determining |
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* NameConstraints minimum and maximum bounds and for calculating |
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* path lengths in name subtrees. |
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* |
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* @return distance of name from root |
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* @throws UnsupportedOperationException if not supported for this name type |
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*/ |
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public int subtreeDepth() throws UnsupportedOperationException { |
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// subtree depth is always at least 1 |
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int sum = 1; |
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// count dots |
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for (int i = name.indexOf('.'); i >= 0; i = name.indexOf('.', i + 1)) { |
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++sum; |
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} |
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return sum; |
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} |
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} |